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Air circulation controller with short-cycle prevention capability

  • US 5,765,636 A
  • Filed: 07/19/1996
  • Issued: 06/16/1998
  • Est. Priority Date: 07/19/1996
  • Status: Expired due to Term
First Claim
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1. A method for controlling the circulation of air for improving indoor air quality of a building having an environmental control system including a system fan, comprising the steps of:

  • a) receiving system settings from a user interface indicating that a user desires controlled air circulation;

    b) engaging the system fan for a circulating air based upon the system settings;

    c) predicting future operation of the system fan due to operation of the environmental control system;

    d) modifying the first interval of time as a function of the predicted operation of the environmental control system in order to prevent nuisance short cycling of the system fan;

    e) disengaging the system fan for a second interval of time such that the ratio of the first interval of time to the second interval of time achieves a minimum desired circulation cycle; and

    f) continuously repeating steps b) through e) while the system settings circulation control mode is selected.

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